I just saw this - nice luger, nice story - obviously your dad over-paid (hah, hah, just April fools days - whether he over-paid or underpaid you can see how it has risen

)
My first Luger was a hard buffed, reblued artillery - my second was a mismatch - upper matched and bottom matched, not to each other.
As to the original holster, it is very hard to say, as older holsters were issued with younger guns and also, many soldiers (US) would grab up a gun and holster from different piles or even trade for a different holster. Heck, it could have been matched up 10 years after WW2
Ed